Polymer blends are capable of providing materials with extended useful properties beyond the range that can be obtained from single polymer. Blends of polystyrene (PS) and polypropylene (PP) with adding acrylonitrile-butadiene-styrene (ABS) or ethylene propylene diene monomer (EPDM) are prepared in different ratios by melt blending technique which was carried out using a double screw extruder. The tensile, flexural, impact and hardness tests of all the prepared samples were study. The results

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... om this work show that the elongation property and impact properties for blend system increase with increase PP content in polymer blend of (PS:PP), also increase value of these properties with increase the ratio of adding (ABS or EPDM) for polymer blend (PS:5%PP).The highest values of impact strength was (10.68Kj/m 2 ) for ternary polymers blend (90%PS:5%PP:5%EPDM) and the high values of fracture toughness (6.125MPa√m ) for ternaty polymer blend (90%PS:5%PP:5%ABS).